What is Energy? • “The ability to do work” • Causes changes • Two forms Potential Kinetic
POTENTIAL ENERGY KE 10/4/2017 2
The Nature of Energy Energy is ALL around you. You hear energy as sound, you see energy as light, and you can feel energy in wind. • Living organisms need energy for growth and movement. • You use energy when you hit a tennis ball, compress a spring, or lift a grocery bag. What is energy? The ability to cause change
Potential Energy Potential Energy - PE Stored energy, energy of position- stored in motionless objects and has the potential to cause change https://youtu.be/ASZv3tIK56k
Potential Energy Perhaps the most common type of PE GPE Gravitational Potential Energy The energy an object or substance has because of its position; anything “up high”
Potential Energy Mechanical Stored Potential Energy Aka - Elastic Energy Energy stored in an object by the application of force which stretches, bends or compresses.
Potential Energy Nuclear Energy or aka Atomic Energy stored in the nucleus of the atom Holds the nucleus together
Potential Energy Chemical Energy https://youtu.be/sinQ06YzbJI Stored in chemicals, fuels, and explosives Stored in the bonds between atoms. When bonds are broken, chemical energy is released. Examples: • Gasoline, wood • Battery • match - before it is lit • food • TNT
KINETIC ENERGY KE 10/4/2017 9
Kinetic Energy Mechanical Energy (Motion) Movement of objects or substances from one place to another Ex: • Water flowing in a waterfall • Wind • Gears in a car https://youtu.be/PM9vnEWmA1c
Kinetic Energy Electrical Energy Moving electric charge. Electrons move among atoms Examples: • Power lines carry electricity • Lightning • Shock from a door knob
Kinetic Energy Sound Energy Movement of energy through substances in the form of longitudinal (compression) waves
Kinetic Energy Radiant Energy Electromagnetic energy that travels in transverse waves Ex:
Kinetic Energy Thermal Energy (a.k.a. Heat) Internal energy of a substance due to the vibration of atoms and molecules making up the substance
Can Energy Change Forms?
Energy Transfers • Law w of Co f Conse nservation ation of f En Energy ergy Energy cannot be created or destroyed, but rather can only be transformed (change forms) or transferred (converted).
Energy Transfers • Fi First st Law w of f Th Thermodynamics ermodynamics Energy will always transfer from high to low. No energy transfer is 100% efficient. Some is always transferred into heat. 10/4/2017 18
The farther back the bow is pulled, the more the PE. What form of PE? What form of KE does the arrow have?
To remember most of the Forms of Energy: S C R E A M T oday!
ENERGY SONG The ENERGY Song - Mr. Edmonds - Rock with "That's the Way - I Like It" music theme ! https://youtu.be/_uLSFigtLKg 3minutes
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